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  Subjects -> CHEMISTRY (Total: 847 journals)
    - ANALYTICAL CHEMISTRY (47 journals)
    - CHEMISTRY (598 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (26 journals)
    - INORGANIC CHEMISTRY (42 journals)
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ANALYTICAL CHEMISTRY (47 journals)

Showing 1 - 0 of 0 Journals sorted alphabetically
Accounts of Chemical Research     Full-text available via subscription   (Followers: 89)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 21)
American Journal of Analytical Chemistry     Open Access   (Followers: 27)
Analytica Chimica Acta     Hybrid Journal   (Followers: 39)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 32)
Analytical Chemistry     Full-text available via subscription   (Followers: 226)
Analytical Chemistry Insights     Open Access   (Followers: 17)
Analytical Chemistry Research     Open Access   (Followers: 2)
Analytical Letters     Hybrid Journal   (Followers: 11)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 9)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 24)
Current Analytical Chemistry     Hybrid Journal   (Followers: 7)
Drug Testing and Analysis     Hybrid Journal   (Followers: 6)
Electroanalysis     Hybrid Journal   (Followers: 5)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 4)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 21)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 3)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 5)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 6)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 10)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 19)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 1)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 5)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 22)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Nigerian Journal of Chemical Research     Full-text available via subscription  
Phytochemical Analysis     Hybrid Journal   (Followers: 2)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 9)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 13)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 5)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 53)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 2)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 11)
World Journal of Analytical Chemistry     Open Access   (Followers: 1)
Journal Cover Journal of Analytical Chemistry
  [SJR: 0.33]   [H-I: 19]   [19 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2335 journals]
  • Determination of nitrite in food samples by second-order calibration of
           kinetic spectrophotometric data
    • Abstract: Abstract A method for the determination of nitrite in soil and vegetable samples by UV-Vis spectroscopy was proposed. The kinetic UV-Vis data were collected during the reaction between nitrite and 4-amino-3-hydroxynaphthalene-1-sulfonic acid with concentration of 0.001 M and pH 1.6. Data were collected by standard addition method. Multivariate curve resolution-alternating least squares was employed to analyze data with non-negativity and three-way data structure constraints. The method can be used to solve matrix effect and unknown interferents in the determination of nitrite in complex samples. The proposed method was used to determine nitrite at low mg/L levels with satisfactory results in soil, lettuce, cabbage and cucumber samples.
      PubDate: 2016-07-01
       
  • Determination of vitamin K 1 in blood serum by high-performance liquid
           chromatography
    • Abstract: Abstract A method is proposed for the determination of vitamin K1 concentration in blood serum using HPLC on a Gemini C18 (250 mm × 4.6 mm ID, 5 μm) column and elution with a methanol–acetonitrile–dichloromethane (45 : 50 : 5, v/v) mobile phase at a flow rate of 1 mL/min and detection at 248 nm. The limit of detection for the vitamin is 0.5 ng/mL and relative error is 19%. The volume of sample in the column is 100 μL. The method has been applied to the evaluation of vitamin K1 deficit in a human body in medical practice.
      PubDate: 2016-07-01
       
  • Effect of 3-methyl-1-cetylimidazolium chloride ionic liquid on the
           electrophoretic preconcentration of steroid hormones
    • Abstract: Abstract We studied the capabilities of different versions of the on-line preconcentration of steroid hormones (field-amplifying sample stacking, sweeping, sweeping in high-salt sample matrix) in micellar electrokinetic chromatography using an ionic liquid (IL) of 3-methyl-1-cetylimidazolium chloride (C16MImCl) as a component of a background electrolyte. The optimal conditions for the preconcentration of hormones are found. The simultaneous addition of the above ionic liquid (0.5 mM) and sodium dodecyl sulfate (25 mM) to the background electrolyte ensures efficiency of up to ∼1 × 106 theoretical plates and detection limits for hormones down to 25–100 ng/mL.
      PubDate: 2016-07-01
       
  • Atomic emission analysis of human hair for the presence of trace elements
    • Abstract: Abstract A procedure is developed for the atomic emission analysis of human hair with the preliminary acid mineralization of samples and excitation of spectra in samples of dry residues of hair mineralizate on the end face of a carbon electrode in an alternating current arch. Spectra were recorded on an MFS-8 spectrograph modernized with a MAES photodiode array. Using the developed analytical procedure, samples of hair were analyzed for the presence of Al, B, Ca, Cu, Mg, Mn, Fe, P, Pb, and Zn. The average concentrations and concentration ranges of these elements were calculated for samples collected from 42 donors. The results obtained were compared with the published data for other geographical regions.
      PubDate: 2016-07-01
       
  • Generation of urinary steroid profiles in patients with adrenal
           incidentaloma using gas chromatography–mass spectrometry
    • Abstract: Abstract A method is developed for the determination of steroid hormones in urine using gas chromatography with mass-spectrometric detection. Sample preparation procedure and the conditions of chromatographic analysis were optimized, and characteristic urinary steroid profiles of patients with adrenocortical cancer were obtained. Criteria for the evaluation of the deficiency of 21-hydroxylase and 11β-hydroxylase in patients with adrenal incidentaloma are proposed.
      PubDate: 2016-07-01
       
  • Gold nanoparticle included graphene oxide modified electrode: Picomole
           detection of metal ions in seawater by stripping voltammetry
    • Abstract: Abstract We obtained a gold nanomaterial/graphene oxide-modified glassy carbon electrode and characterized it using transmission electron microscope, scanning electron microscope, cyclic voltammetry (CV), and X-ray photoelectron spectroscopy techniques. A response of the electrode using square wave anodic stripping voltammetry for Pb2+, Cu2+, and Hg2+ was found linear in the range from 1 × 10–7 to 1 × 10–11 M. The detection limits of Pb2+, Cu2+ and Hg2+ were 0.14, 0.5 and 1.2 pM, respectively. The method was applied to the simultaneous determination of Pb2+, Cu2+ and Hg2+ in seawater samples from a coastal region of Anatolia, and the results corresponded well with the values obtained by inductively coupled plasma-optical emission spectroscopy.
      PubDate: 2016-07-01
       
  • Sensitive detection of dopamine using micelle-enhanced and
           terbium-sensitized fluorescence
    • Abstract: Abstract A new terbium sensitized spectrofluorimetric method was developed for the determination of trace amounts of dopamine (DA) using ethylenediaminetetraacetic acid as co-ligand and cetyltrimethylammonium chloride as sensitizer. UV absorption and fluorescent spectra were used to investigate the photophysical properties of the ternary complex. Under the optimum conditions, the enhanced fluorescence intensities of the Tb(III) complexes increased linearly with the concentration of DA over the ranges 8 × 10–8–5 × 10–5 M and the limit of detection for DA was found to be 2.4 × 10–8 M. The proposed method has been applied for the quantitative determination of DA in a pharmaceutical preparation and urine samples. The possible energy transfer mechanisms in the lanthanide complexes were discussed.
      PubDate: 2016-07-01
       
  • Optimization of solid phase microextraction procedure for determination of
           paraquat using reduction process
    • Abstract: Abstract Headspace solid phase microextraction (HS-SPME) followed by gas chromatography–mass spectrometry was developed for the determination of paraquat in urine. The volatile product resulting from reduction of paraquat by sodium borohydride–nickel chloride was used for HS-SPME. The calibration curve was linear from 10–1000 ng/mL and the limit of detection was 0.1 ng/mL. The optimized methods were validated using 500 and 750 ng/mL concentrations of paraquat in the spiked urine samples. The recoveries obtained in this study were 98.2% for intra-day (n = 6) and 99.2% for inter-day (n = 6), respectively, with RSD lower than 1.1%.
      PubDate: 2016-07-01
       
  • Rapid diagnosis of mycobacterium tuberculosis with electrical impedance
           spectroscopy in suspensions using interdigitated microelectrode
    • Abstract: Abstract A Mycobacterium tuberculosis (MTB) bacilli are still widely spreading and have to be diagnosed fast and efficiently. Therefore, a new simple and rapid method was proposed to detect MTB by the impedance properties of MTB suspensions using interdigitated microelectrodes. As a result, MTB suspensions in deionized (DI) water with different cell concentrations generated different electrical impedance spectral responses. Whereas MTB suspensions in 0.9 wt. % NaCl solution did not produce any significant differences in the impedance spectra in response to different cell concentrations. In DI water suspensions, the impedance at 1 kHz decreased with increasing cell concentrations. The impedance of MTB suspension in DI water has been discussed; it was found to be resulted from the cell wall charges and release of ions from the cells. There was a linear relationship between the impedance and logarithmic value of the cell concentration in the cell concentration range of 102 to 108 cfu/mL, which can be expressed by the regression equation of Z (kΩ) =–456lnN (cfu/mL) + 9717 with R 2 = 0.99. Detection limit was calculated as 104 cfu/mL, which is comparable with many label-free immunosensors for detecting pathogenic bacteria reported in the literature. This work demonstrated that MTB concentration can be determined through measuring the impedance of MTB suspensions in DI water. This new detection mechanism can be an alternative for current impedance methods available for detecting bacterial cells.
      PubDate: 2016-07-01
       
  • Determination of gasoline and diesel residues on wool, silk, polyester and
           cotton materials by SPME–GC–MS
    • Abstract: Abstract The identification of ignitable liquids is very important and challenging aspect in arson crime investigations. The detection of gasoline and diesel fuel components using solid phase micro-extraction prior to gas chromatography–mass spectrometry for the forensic analysis of fire debris has been carried out. Previous works show that the absorption characteristics of the substrate are one of the most important factors in determining the evaporation rate of the accelerants. In order to determine the presence of the fuel residues, four of the most common substrate materials were tested in this work; wool, cotton, silk and polyester. The obtained results indicate that both gasoline and diesel fuel accelerants persisted longer on wool and silk than on the other selected substrates. Such information illustrates the influence of fuel persistence times after extinguishing and the best materials to be scanned for ignitable liquids at the fire scene.
      PubDate: 2016-07-01
       
  • Determination of adduct forms of antitumor ruthenium(III) complex with
           cytosolic components by capillary electrophoresis with mass spectrometry
    • Abstract: Abstract Using capillary electrophoresis with inductively coupled plasma mass spectrometry, the transformation of adduct forms of indazolium trans-[tetrachloridobis(1H-indazole)ruthenate(III)] with apo-transferrin and albumin under the effect of active intracellular reducing agents, glutathione and ascorbic acid, and citric acid as a complexant was studied under conditions simulating a cytosolic environment. These adducts of ruthenium with transport proteins are forms in which the anticancer drug exists after intravenous administration. Two modes of interaction of adducts with glutathione, ascorbic acid, and citric acid were studied: in a capillary using a background electrolyte containing a cytosolic active ingredient and upon incubation of the reaction components in the off-line mode, followed by their separation and determination by capillary electrophoresis. Incubation with intracellular components and separation were carried out in a 10 mM phosphate buffer solution (pH 6.0) containing 4 mM NaCl. The effect 1–10 mM of glutathione, 10 mM of ascorbic acid, and 50 mM of citric acid on the adducts was studied. It is shown that under the selected model conditions, new forms of ruthenium do not emerge.
      PubDate: 2016-07-01
       
  • Modeling of a new chromatographic system using the IONCHROM software and
           the choice of the optimum mode of chromatographic analysis
    • Abstract: Abstract Using the IONCHROM software, we performed modeling of a new chromatographic system on an example of an ion chromatograph from METROHM. To determine all necessary parameters, we had to construct a dynamic map of this system, by which the conditions of the required separation were found in different pH and concentration ranges, after which three or four experiments with the chosen eluents were sufficient. The model corrected with the the found parameters was used to predict the behavior of the system and, in particular, to optimize the analysis.
      PubDate: 2016-07-01
       
  • Nondestructive classification and identification of ballpoint pen inks by
           Raman spectroscopy for forensic document examinations
    • Abstract: Abstract As a non-destructive analytical method, Raman spectroscopy often provides insufficient information to identify or differentiate the ink used for the preparation of a questioned document. In this study, blue and black ballpoint pen inks deposited on paper substrate were examined in situ by conventional Raman spectroscopy. Inks were successfully classified based on the total number of prominent bands in Raman spectra. It was found that more than 90% of the samples of the same type and color could be differentiated visually using only Raman spectra, i.e. 94 and 95% for blue and black inks, respectively. As a result of this study, a flow chart has been constructed for blue and black ballpoint pen inks allowing their systematic identification. Raman spectroscopy proved to be a fast and precise technique for forensic ink analysis.
      PubDate: 2016-07-01
       
  • Extraction and determination of biologically active components of St.
           John’s wort and its pharmaceutical preparations
    • Abstract: Abstract A procedure is developed for the determination of biologically active substances (BAS) of common St. John’s wort (Hypericum perforatum L.) by HPLC using two columns, Luna C18, 100 Å (for the determination of phenolcarboxylic acids and flavonoids), and Onyx Monolithic C18 (for the determination of phloroglucinols and naphthodianthrones), in the gradient elution mode with diode array detection. The detection limits for analytes are 0.05–0.20 μg/mL. To optimize the conditions, we studied the extraction of biologically active substances from St. John’s wort by a water–ethanol solution at different temperatures and pressures and under the effect of microwave radiation and ultrasound. The maximum amounts of substances were extracted in a dynamic mode under heat and pressure. The procedure was applied to the St. John’s wort samples of different brands and some pharmaceutical products based on it. The components of extracts were identified by retention times, UV spectra, and mass spectra. It was shown that the content of biologically active substances in pharmaceutical samples of St. John’s wort depends on the herb habitat. It was shown that hyperforin decomposed in pharmaceutical formulations based on St. John’s wort during storage.
      PubDate: 2016-07-01
       
  • Isotope analysis of 72 GeH 4 , 73 GeH 4 , 74 GeH 4 , and 76 GeH 4
           monogermanes by inductively-coupled plasma high-resolution mass
           spectrometry (ICP–MS)
    • Abstract: Abstract A possibility of using inductively-coupled plasma high-resolution mass spectrometry for the isotope analysis of monogermanes enriched with isotopes 72, 73, 74, and 76 has been studied. The effects of isobaric and polyatomic interferences in the spectrum of germanium isotopes have been discussed. It has been shown that the signal intensities of i GeH+ ions formed in the inductively coupled plasma are 0.00001–0.0001 of the intensity of the i Ge+ signal. This can result in the overestimation of the found concentration of an isotope with a higher mass number next to the main isotope in recording spectra in the low and medium resolution mode. Approaches ensuring the determination of the isotope composition of highly-enriched monogermanes with the range of isotope concentrations extending five orders of magnitude have been proposed.
      PubDate: 2016-07-01
       
  • Preconcentration and determination of naproxen in water samples by
           functionalized multi-walled carbon nanotubes hollow fiber solid phase
           microextraction—HPLC
    • Abstract: Abstract A simple, sensitive and selective solid phase microextraction with hollow fiber-supported multi-walled carbon nanotube functionalization reinforced sol–gel combined HPLC method was proposed for the determination of naproxen in tap, well and river water samples. In this method, functionalized multi-walled carbon nanotubes (MWCNTs) were prepared and held in pores of hollow fiber with sol–gel technology by immersion of polypropylene hollow fiber segment into the sol of the functionalized MWCNTs/silica composite and ultrasonically treated at room temperature. Effect of main parameters such as volume of donor phase, pH, extraction time, desorption time, type of desorption solvent, sample ionic strength and stirring rate were studied. Under optimum conditions, linearity was observed in the range of 0.03–500 ng/mL, with correlation coefficients of 0.997. The relative standard deviation for three replicate determinations of 50 ng/mL of naproxen was 4.3%. Limit of detection and pre-concentration factor were 0.008 ng/mL and 198, respectively. In order to check the applicability of the proposed method, it was used to determine trace levels of naproxen in different water samples.
      PubDate: 2016-07-01
       
  • Specific features of determinations of the composition of high-purity
           lanthanide crystal hydrates
    • Abstract: Abstract Problem of the determination of the composition of high-purity rare-earth metal salts is discussed. Prospects of the application of direct chemical methods to the determination of the water content of crystal hydrates of rare-earth metal salts used in the GET 173-2013 State Primary Standard of Mass Fraction and Mass (Molar) Concentration of Water in Solid and Liquid Substances and Materials are studied.
      PubDate: 2016-06-01
       
  • Flotation-assisted dispersive liquid–liquid microextraction method
           for preconcentration and determination of trace amounts of cobalt:
           Orthogonal array design
    • Abstract: Abstract A simple, rapid, and efficient flotation-assisted dispersive liquid–liquid microextraction method was developed for preconcentration of trace amount of cobalt(II) ions. In this technique, a mixture of toluene and methanol (20: 80, v/v) was injected through the septum in the bottom of a narrow-bore tube containing cobalt solution. Afterwards, the fine droplets of extraction solvent were formed and cobalt (as 1-nitroso-2- naphtol complex) was collected on the surface of solution by aeration. The effect of different variables on the extraction efficiency of cobalt such as pH of solution, ligand concentration and injection volume was investigated using orthogonal array design. At optimum conditions, the calibration curve was linear over the range of 10–1000 μg/L. The detection limit, relative standard deviation and enrichment factor were 3 μg/L, 3.9% (n = 10) and 120, respectively. The developed method was successfully applied to the determination of cobalt in water and drug samples.
      PubDate: 2016-06-01
       
  • HPLC—high-resolution time-of-flight mass spectrometry:
           Identification and determinarion of β-agonists in food and feed
    • Abstract: Abstract A method is proposed for the simultaneous identification and determination of 19 β-agonists by exact ion masses in feed, meat, liver, and kidneys of animals using high-resolution time-of-flight mass spectrometry combined with HPLC and simple and fast sample preparation. Matrix effects under the conditions of electrospray ionization were eliminated by the dilution of the extract with a 10-fold volume of deionized water. A scheme of the identification and determination of analytes by the standard addition method is proposed. The limits of detection are 0.11–10 ng/g and limits of quantification, 0.34–31 ng/g. The relative standard deviation of the results of analysis does not exceed 13%. The time of analysis is 1–2 h.
      PubDate: 2016-06-01
       
  • Simultaneous determination of trimethoprim, enrofloxacin, and
           ciprofloxacin in blood serum of poultry
    • Abstract: Abstract A method is proposed for the simultaneous determination of trimethoprim, enrofloxacin, and ciprofloxacin in blood serum of poultry using HPLC. Samples were prepared using protein precipitation. The chromatographic separation of substances was attained on a C18 column using a mixture of a 50 mM acetate buffer solution (pH 3.0) with acetonitrile (86: 14) as a mobile phase. Detection was performed at 278 nm. Linearity was observed in the concentration range 50–5000 ng/mL for trimethoprim and 10–5000 ng/mL for ciprofloxacin and enrofloxacin. Precision was ≤2.1% for enrofloxacin, ≤1.6% for ciprofloxacin, and ≤14% for trimethoprim. Accuracy was ≤10.2% for enrofloxacin, ≤9.9% for ciprofloxacin, and ≤11.9% for trimethoprim. The method was applied to pharmacokinetic studies of complex antibacterial drugs containing trimethoprim and enrofloxacin as active substances.
      PubDate: 2016-06-01
       
 
 
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